ENVI 101 Lecture Notes - Lecture 4: Girdling, Hemlock Woolly Adelgid, Acer Rubrum
13 Sep 2016
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Nature preserve is second growth bc the trees have regenerated after being cut down for industrialization. Old growth would be an undisturbed forest. Losing leaves makes sense to save energy by not performing photosynthesis all year. Colder climates tend to be dryer climates. Evergreen trees are good at retaining moisture. Hemlock woolly adelgid: invasive from asia, sucks sap of hemlock, prevents growth. Invasive asian beetle creates burrows in bark of tree, cutting off the flow of sugars, eventually girdling (killing) the trees. Estimated that we may lose all of our ash trees in this area. Lateral veins terminate right at the tip of the serrations. Pinnately compound (3 leaflets that are fully divided) Ecosystems: communities of organisms interacting with one another and with the physical environment of matter and energy in which they live. Relatively small are harbouring vast biodiversity (2% of our land mass) B/c it is a constant environment, with abundant precipitation and sunlight.
